package com.ttdc.controller;

import java.awt.image.BufferedImage;

import javax.imageio.ImageIO;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.servlet.ModelAndView;

import com.google.code.kaptcha.Constants;
import com.google.code.kaptcha.Producer;

@Controller
public class NewKaptchaController {

	    //生成验证码Controller.
	    private Producer captchaProducer = null;

	    @Autowired
	    public void setCaptchaProducer(Producer captchaProducer){
	        this.captchaProducer = captchaProducer;
	    }

	    @RequestMapping("kaptcha.jpg")
	    public ModelAndView handleRequest(HttpServletRequest request, HttpServletResponse response) throws Exception{
	        response.setDateHeader("Expires", 0);
	        response.setHeader("Cache-Control", "no-store, no-cache, must-revalidate");
	        response.addHeader("Cache-Control", "post-check=0, pre-check=0");
	        response.setHeader("Pragma", "no-cache");
	        response.setContentType("image/jpeg");
	        String capText = captchaProducer.createText();
	        request.getSession().setAttribute(Constants.KAPTCHA_SESSION_KEY, capText);
	        BufferedImage bi = captchaProducer.createImage(capText);
	        ServletOutputStream out = response.getOutputStream();
	        ImageIO.write(bi, "jpg", out);
	        
	        try {
	            out.flush();
	        } finally {
	            out.close();
	        }
	        return null;
	    }
}
